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Photoresponse mechanisms of ultraviolet photodetectors based on colloidal ZnO quantum dot-graphene nanocomposites

Title
Photoresponse mechanisms of ultraviolet photodetectors based on colloidal ZnO quantum dot-graphene nanocomposites
Author
김태환
Keywords
II-VI semiconductors; Quantum dots; Photodetectors; Ultraviolet light; Graphene
Issue Date
2013-01
Publisher
AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Citation
Applied Physics Letters, Vol.102, No.2 [2013], p021105-1 ~021105-3
Abstract
Ultraviolet (UV) photodetectors were fabricated using the wet spin-coating for ZnO quantum dots (QDs) and the transfer method for the graphene sheet. High-resolution transmission electron microscopy images showed that the ZnO QDs were uniformly distributed between the voids of the surface circumferences on the graphene layers. Current-voltage measurements on the UV photodetector at 300 K showed that the ratio of the photocurrent to the dark current was about 1.1 x 10(4). The rise and the decay times of the UV photodetector were approximately 2 and 1 s, respectively. The photoresponse mechanisms are described on the basis of the experimental results. (C) 2013 American Institute of Physics. [http://dx.doi.org.access.hanyang.ac.kr/10.1063/1.4776651]
URI
http://aip.scitation.org/doi/10.1063/1.4776651http://hdl.handle.net/20.500.11754/41509
ISSN
0003-6951
DOI
10.1063/1.4776651
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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